AR-STONER AR-15 Build Kit 5.56 18″ Mid-Length – Complete Upper + Lower Parts + Stock

AR-STONER AR-15 Build Kit — complete 5.56 NATO assembly package that includes a full upper receiver, lower parts kit, and 6-position collapsible stock so you only need a stripped lower to finish your rifle.

The upper features an 18-inch 4150 chrome-moly vanadium barrel with a 1:7 twist, mid-length gas system, and A2 flash hider. A 15-inch free-float M-LOK handguard with integrated QD sling points gives you plenty of real estate for lights, grips, and bipods. The A3 flat-top upper is machined with M4 feed ramps for reliable feeding and fits any standard AR-15 lower.

The complete lower parts kit supplies every pin, spring, hammer, trigger, safety selector, magazine catch, and A2 grip needed to build a functional lower. The mil-spec 6-position stock assembly includes a hard-coat anodized buffer tube, carbine buffer and spring, castle nut, and end plate for a solid, adjustable cheek weld and length of pull.

This AR-15 build kit 5.56 and AR-STONER 18 inch upper combination delivers an affordable, ready-to-assemble platform that balances accuracy, modularity, and value for range or defensive use.